Phonon-Polaritons in Lead Halide Perovskite Film Hybridized with THz Metamaterials

被引：34

作者：

Kim, Hwan Sik ^{[1
,2
]}

Ha, Na Young ^{[1
,2
]}

Park, Ji-Yong ^{[1
,2
]}

Lee, Soonil ^{[1
,2
]}

Kim, Dai-Sik ^{[3
]}

Ahn, Yeong Hwan ^{[1
,2
]}

机构：

[1] Ajou Univ, Dept Phys, Suwon 16499, South Korea

[2] Ajou Univ, Dept Energy Syst Res, Suwon 16499, South Korea

[3] Ulsan Natl Inst Sci & Technol, Dept Phys, Ulsan 44919, South Korea

来源：

NANO LETTERS | 2020年 / 20卷 / 09期

基金：

新加坡国家研究基金会;

关键词：

Phonon-polariton; Perovskite; Terahertz; Metamaterials; Strong coupling; Crystal domain; 2ND-HARMONIC GENERATION; VIBRATIONAL-MODES; RAMAN-SCATTERING; TERAHERTZ; RESONANCES; CONDENSATION;

D O I：

10.1021/acs.nanolett.0c02572

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

In this work, we demonstrated a phonon-polariton in the terahertz (THz) frequency range, generated in a crystallized lead halide perovskite film coated on metamaterials. When the metamaterial resonance was in tune with the phonon resonance of the perovskite film, Rabi splitting occurred due to the strong coupling between the resonances. The Rabi splitting energy was about 1.1 meV, which is larger than the metamaterial and phonon resonance line widths; the interaction potential estimation confirmed that the strong coupling regime was reached successfully. We were able to tune the polaritonic branches by varying the metamaterial resonance, thereby obtaining the dispersion curve with a clear anticrossing behavior. Additionally, we performed in situ THz spectroscopy as we annealed the perovskite film and studied the Rabi splitting as a function of the films crystallization coverage. The Rabi splitting versus crystallization volume fraction exhibited a unique power-law scaling, depending on the crystal growth dimensions.

引用

页码：6690 / 6696

页数：7

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